<?php
/**
 * 功能：php生成缩略图片的类
 */
class ResizeImage{
    public $type;//图片类型
    public $width;//实际宽度
    public $height;//实际高度
    public $resize_width;//改变后的宽度
    public $resize_height;//改变后的高度
    public $cut;//是否裁图
    public $srcimg;//源图象
    public $dstimg;//目标图象地址
    public $im;//临时创建的图象
    public $quality;//图片质量
    function __construct($oldImg,$newImg,$newWidth,$newHeight,$isCut=0,$quality=100){
        $this->srcimg=$oldImg;
        $this->resize_width=$newWidth;
        $this->resize_height=$newHeight;
        $this->cut=$isCut;
        $this->quality=$quality;
        $this->type=strtolower(substr(strrchr($this->srcimg,'.'),1));//图片的类型
        $this->initi_img();//初始化图象
        $this -> dst_img($newImg);//目标图象地址
        @$this->width=imagesx($this->im);
        @$this->height=imagesy($this->im);
        $this->newimg();//生成图象
        @ImageDestroy($this->im);
    }
    function newimg(){
        $resize_ratio=($this->resize_width)/($this->resize_height);//改变后的图象的比例
        @$ratio=($this->width)/($this->height);//实际图象的比例
        if(($this->cut)=='1'){//裁图
            /* if($img_func==='imagepng'&&(str_replace('.','',PHP_VERSION)>=512)){	//针对php版本大于5.12参数变化后的处理情况
                 $quality=9;
             }*/
            if($ratio>=$resize_ratio){//高度优先
                $newimg=imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,$this->resize_height,(($this->height)*$resize_ratio),$this->height);
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
            if($ratio<$resize_ratio){//宽度优先
                $newimg=imagecreatetruecolor($this->resize_width,$this->resize_height);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,$this->resize_height,$this->width,(($this->width)/$resize_ratio));
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
        }else{//不裁图
            if($ratio>=$resize_ratio){
                $newimg=imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
                imagecopyresampled($newimg,$this->im,0,0,0,0,$this->resize_width,($this->resize_width)/$ratio,$this->width,$this->height);
                imagejpeg($newimg,$this->dstimg,$this->quality);
            }
            if($ratio<$resize_ratio){
                @$newimg=imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
                @imagecopyresampled($newimg,$this->im,0,0,0,0,($this->resize_height)*$ratio,$this->resize_height,$this->width,$this->height);
                @imagejpeg($newimg,$this->dstimg,$this->quality);
            }
        }
    }
    function initi_img(){//初始化图象
        $this->im = myimage::createFromAny($this->srcimg);
    }
    function dst_img($dstpath){//图象目标地址
        $full_length=strlen($this->srcimg);
        $type_length=strlen($this->type);
        $name_length=$full_length-$type_length;
        $name=substr($this->srcimg,0,$name_length-1);
        $this->dstimg=$dstpath;
        //echo $this->dstimg;
    }

    function ImageCreateFromBMP($filename){	//自定义函数处理bmp图片
        if(!$f1=fopen($filename,"rb"))returnFALSE;
        $FILE=unpack("vfile_type/Vfile_size/Vreserved/Vbitmap_offset",fread($f1,14));
        if($FILE['file_type']!=19778)returnFALSE;
        $BMP=unpack('Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel'.
            '/Vcompression/Vsize_bitmap/Vhoriz_resolution'.
            '/Vvert_resolution/Vcolors_used/Vcolors_important',fread($f1,40));
        $BMP['colors']=pow(2,$BMP['bits_per_pixel']);
        if($BMP['size_bitmap']==0)$BMP['size_bitmap']=$FILE['file_size']-$FILE['bitmap_offset'];
        $BMP['bytes_per_pixel']=$BMP['bits_per_pixel']/8;
        $BMP['bytes_per_pixel2']=ceil($BMP['bytes_per_pixel']);
        $BMP['decal']=($BMP['width']*$BMP['bytes_per_pixel']/4);
        $BMP['decal']-=floor($BMP['width']*$BMP['bytes_per_pixel']/4);
        $BMP['decal']=4-(4*$BMP['decal']);
        if($BMP['decal']==4)$BMP['decal']=0;
        $PALETTE=array();
        if($BMP['colors']<16777216)
        {
            $PALETTE=unpack('V'.$BMP['colors'],fread($f1,$BMP['colors']*4));
        }
        $IMG=fread($f1,$BMP['size_bitmap']);
        $VIDE=chr(0);
        $res=imagecreatetruecolor($BMP['width'],$BMP['height']);
        $P=0;
        $Y=$BMP['height']-1;
        while($Y>=0)
        {
            $X=0;
            while($X<$BMP['width'])
            {
                if($BMP['bits_per_pixel']==24)
                    $COLOR=unpack("V",substr($IMG,$P,3).$VIDE);
                elseif($BMP['bits_per_pixel']==16)
                {
                    $COLOR=unpack("n",substr($IMG,$P,2));
                    $COLOR[1]=$PALETTE[$COLOR[1]+1];
                }
                elseif($BMP['bits_per_pixel']==8)
                {
                    $COLOR=unpack("n",$VIDE.substr($IMG,$P,1));
                    $COLOR[1]=$PALETTE[$COLOR[1]+1];
                }
                elseif($BMP['bits_per_pixel']==4)
                {
                    $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
                    if(($P*2)%2==0)$COLOR[1]=($COLOR[1]>>4);else$COLOR[1]=($COLOR[1]&0x0F);
                    $COLOR[1]=$PALETTE[$COLOR[1]+1];
                }
                elseif($BMP['bits_per_pixel']==1)
                {
                    $COLOR=unpack("n",$VIDE.substr($IMG,floor($P),1));
                    if(($P*8)%8==0)$COLOR[1]=$COLOR[1]>>7;
                    elseif(($P*8)%8==1)$COLOR[1]=($COLOR[1]&0x40)>>6;
                    elseif(($P*8)%8==2)$COLOR[1]=($COLOR[1]&0x20)>>5;
                    elseif(($P*8)%8==3)$COLOR[1]=($COLOR[1]&0x10)>>4;
                    elseif(($P*8)%8==4)$COLOR[1]=($COLOR[1]&0x8)>>3;
                    elseif(($P*8)%8==5)$COLOR[1]=($COLOR[1]&0x4)>>2;
                    elseif(($P*8)%8==6)$COLOR[1]=($COLOR[1]&0x2)>>1;
                    elseif(($P*8)%8==7)$COLOR[1]=($COLOR[1]&0x1);
                    $COLOR[1]=$PALETTE[$COLOR[1]+1];
                }
                else
                    returnFALSE;
                imagesetpixel($res,$X,$Y,$COLOR[1]);
                $X++;
                $P+=$BMP['bytes_per_pixel'];
            }
            $Y--;
            $P+=$BMP['decal'];
        }
        fclose($f1);
        return$res;
    }

}
